[PATCH] D39473: [sanitizers] Add init function to set alignment of low level allocator

[Walter Lee via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
waltl marked an inline comment as done.
Closed by commit rL318717: [sanitizers] Add init function to set alignment of low level allocator (authored by waltl).

Changed prior to commit:
  https://reviews.llvm.org/D39473?vs=123633&id=123693#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D39473

Files:
  compiler-rt/trunk/lib/asan/asan_rtl.cc
  compiler-rt/trunk/lib/sanitizer_common/sanitizer_allocator.cc
  compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h


Index: compiler-rt/trunk/lib/asan/asan_rtl.cc
===================================================================
--- compiler-rt/trunk/lib/asan/asan_rtl.cc
+++ compiler-rt/trunk/lib/asan/asan_rtl.cc
@@ -407,6 +407,7 @@
   MaybeReexec();
 
   // Setup internal allocator callback.
+  SetLowLevelAllocateMinAlignment(SHADOW_GRANULARITY);
   SetLowLevelAllocateCallback(OnLowLevelAllocate);
 
   InitializeAsanInterceptors();
Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_allocator.cc
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_allocator.cc
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_allocator.cc
@@ -178,11 +178,13 @@
 }
 
 // LowLevelAllocator
+constexpr uptr kLowLevelAllocatorDefaultAlignment = 8;
+static uptr low_level_alloc_min_alignment = kLowLevelAllocatorDefaultAlignment;
 static LowLevelAllocateCallback low_level_alloc_callback;
 
 void *LowLevelAllocator::Allocate(uptr size) {
   // Align allocation size.
-  size = RoundUpTo(size, 8);
+  size = RoundUpTo(size, low_level_alloc_min_alignment);
   if (allocated_end_ - allocated_current_ < (sptr)size) {
     uptr size_to_allocate = Max(size, GetPageSizeCached());
     allocated_current_ =
@@ -199,6 +201,11 @@
   return res;
 }
 
+void SetLowLevelAllocateMinAlignment(uptr alignment) {
+  CHECK(IsPowerOfTwo(alignment));
+  low_level_alloc_min_alignment = Max(alignment, low_level_alloc_min_alignment);
+}
+
 void SetLowLevelAllocateCallback(LowLevelAllocateCallback callback) {
   low_level_alloc_callback = callback;
 }
Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h
@@ -206,6 +206,8 @@
   char *allocated_end_;
   char *allocated_current_;
 };
+// Set the min alignment of LowLevelAllocator to at least alignment.
+void SetLowLevelAllocateMinAlignment(uptr alignment);
 typedef void (*LowLevelAllocateCallback)(uptr ptr, uptr size);
 // Allows to register tool-specific callbacks for LowLevelAllocator.
 // Passing NULL removes the callback.


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D39473.123693.patch
Type: text/x-patch
Size: 2217 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20171121/b36aca85/attachment.bin>